Back gage for paper-cutting machines



(No Model.)

A. S. B-OGART & J. J; NESMITH. BACK GAGEI'OR PAPER CUTTING MACHINES.

No. 507,963. Patented Oct. 31, 1893.

mezafom efozz Q/ v UNIT D STATES PATENT OFFICE.

ARTHUR'S. BOGART AND JOHN J. NESMITH, OF WARREN, PENNSYLVANIA.

BACK GAGEFOR PAPER-CUTTING MACHINES SPECIFICATION forming part ofLetters Patent No. 507,963, dated October 31, 1893. Application filedDecember 27. 1892. $erial Nb. 456,440. (no model.)

To all whom it may concern:

Be it known that we, ARTHUR S. BoeARr and JOHN J NESMITH, citizens ofthe United States, residing at Warren, in the county of Warren and Stateof Pennsylvania, have invented new and useful Improvements in Back Gagesof Paper-Cutting Machines, of which the following is a specification.

This invention relates to improvements in gage adjusting mechanism forpaper cutting machines and consists in the novel features ofconstruction and combination of devices, as hereinafter described andclaimed, for permitting a quick adjustment of the gage where by it canbe moved at once to any desired position independent of the usual slowoperation of the ordinary screw shaft.

In the annexed drawings Figure 1 is aside I elevation of so much of apaper cutting n1a chine as is required to illustrate our invention. Fig.2 is an inverted plan of the same. Fig. 3 is a vertical transversesection of the machine in front of the gage.

Referring to the drawings the numeral 1 designates the supports of thetable 2 on which the paper is to be placed. The back gage 3 is attachedto a suitable slide 4 thatis longitudinally movable in a slot or openingformed in the table. To the under side of this gage slide 4 is secured adepending block 5 having a perforation of sufficient size to enable theblock to loosely surround a screw shaft 6 that is also suitablysupported at one end of the machine frame. On the opposite sides of thescrew shaft 6 and having their.

upper ends pivoted respectively to the front and rear of the block 5 arearranged two depending blades7 and 8 that have their lower endsconnected by springs 9 to pins or lugs 10 on the lower end of saidblock. By the action of these springs 9 the blades 7 and 8 are drawntoward each other and into engagement with the opposite sides of thescrew shaft. When thus engaged'with the screw shaft the blades 7 and 8serve as the threads of a nut so that if the screw-shaft is now turnedin either direction, by means of a crank handle 11 on its outer end, thegage 3 will be moved slowly forward or back, as the case may be, untilthe required adjustment is obtained. To the lower end of the block 5 arepivoted two horizontally arranged angle levers 12 and 13. The lever 12has one arm in contact with the inner edge of the blade7 and its otherarm in contact with the outer edge of the blade 8 while the lever 13 hasone arm in contact with the inner edge of the blade 8 and to its otherarm is attached a cord 14 that is passed partly around a pulley 15 andthen through a guide opening at the other end of the machine. To the endof the cord 14 a handle 16 may be attached. By grasping this handle anddrawing on the cord 14 the angle lever 13 will force the blade 8 outwardor away from the screw shaft and" at the same time cause the blade 8 toactuate the lever 12 so as to likewise force the blade 7 from itsengagement with the screw shaft. While the blades 7 and 8 are thus heldfrom engagement with the screw shaft the gage 3 and attached slide andblock can be rapidly moved any. distance to the required position withrelation to the table and the cutting mechanism without incurring thedelay of the usual slow adjustment by means of the screw shaft. Ifdesired a vertical shaft 17 may be passed through the slide 4 and block5 and be provided at its upper end with edge of the blade 7 and thusdisengage it the blade 8 is disengaged. The blades 7 and 8 may thus bedisengaged from the screw shaft either by the action of the levers 12and 13 operated through the cord 14 or by the action of the lever 12 andarm 19 when operated by the crank 18 on the shaft that carries said arm.After the quick adjustment of the gage has been made and the cord 14, orcrank 18, released, the springs 9 will draw the blades 7 and 8 againinto engagement with the screw shaft so that any further or from thescrew shaft at the same time that exact adjustment of the gage can bemade gradually by turning the screw shaft in a proper direction. It willbe observed that when the cord 14 is pulled to disengage the blades 7and 8 from the screw shaft it will also at the same time drawthe gageback by reason of one end of the cord being attached to the lever 13which through the block 5 is connected with the gage slide. The cord 14possesses the additional advantage of not being in the way as theprojecting end of a rod would be. When the vertical shaft 17 is rotatedfor the purpose of causing its arm 19 to disengage a the blades 7 and, 8from the screw shaft 6 the gage can be quickly moved either forward orback, as required.

What we claim as our invention is 1. The combination withthe screw shaftand the slide having attached thereto a perforated block that looselysurrounds said screw shaft, of the pivoted blades attached to said blockon opposite sides of the screw shaft,- springs attached to said bladesand adapted to hold them in engagement with the screw shaft, a lever foractuating one of said blades to disengage it from the screw shaft and alever for transmitting motion from one blade to' the other whereby bothare disem gaged from the screw shaft at once against the action of theirsprings, substantially as described.

2. The combination with the screw shaft 6 and the" slide ethavingattached thereto aper forated block 5 that loosely surrounds said screwshaft, of the pivoted blades 7 and 8 provided with springs 99, the lever12 having .one arm engaged with the inner edge of the blade 7 and itsother arm engaged with the outeredge of the blade 8 and means foractuating the blade 8 to disengage both blades from the screw shaft,substantially as described.

3. The combination with the screw shaft 6 and the slide 4 havingattached thereto a perforated block 5 that loosely surrounds said

